- 557 - 
the control of thrips and aphids on cauliflowers in seed beds, tobacco 
dust was superior to nicotine sulphate dust mixture containing 2 
• percent nicotine or nicotine sijlphate spray, 1 pt. to 10^ gal. 
Tobacco dust was more toxic to Myzus per s i cap Sulz. when diluted with 
hydrated lime than undiluted. A 2 percent nicotine-lime dust gave 
good control of thrips and aphids in a field of young cauliflowers. 
TJATSOH, J. R. (2332) 
1926. ANOTHER YEAR' S EXPERIENCE WITH CITRUS APHIS. Ela. Hort. Soc. 
Proc. 39: 159-164. [Abstract in Rev. Appl. Ent. (A) 16: 
196-197. 1928.] 
Isolated colonies of aphids appearing during winter should 
be dipped in a bucket containing 40-percent nicotine sulphate, 
using a table spoonful and 1 or 2 oz, soap to 1 gal. water; or if 
they are on larger limbs that cannot be dipped, spot dusting should 
be done when there i s no wind. For heavy infestations, dusting 
under tents has resulted in an average mortality of 99.5 percent. 
Dusting with nicotine sulphate and lime on a still day has proved 
the best treatment for bearing citius groves in Florida, and as 
still days are rare during the time of aphid activity a kind of 
hood has been used which makes dusting possible even in a stiff 
breeze. 
(2333) 
1926. REPORT OF THE ENTOMOLOGIST. Fla. Agr. Expt. Sta. Rept. , 
1925-25, pp. 42R-50R. [Abstract in Rev. Appl. Ent. (A) 15: 585- 
586. 1927.] 
In tests against aphids a traveling hood was fitted over a 
power dusting machine to permit dusting to be done in a wind. 
This was found to be entirely practical for use with trees up to 
a height of 20 feet. The most promising insecticide used was finely 
ground tobacco, which adheres well when applied to wet foliage, and 
not only kills the aphids on the foliage but acts as a repellent 
for a few days. This material is very much cheaper than dusts of 
nicotine sulphate and lime. Control tests against the bean leaf- 
hopper (Empoasca fabae Harr.) consists mainly of spraying or dusting 
the beans, using a hood of some sort that can be moved along the row. 
Dusting with 3 percent nicotine dust caused 80 to 90 percent of the 
leafhoppers to fall to the ground, but after a few minutes a great 
many of them were observed to revive a»d crawl back. With a 5 percent 
dust practically all leafhoppers, both nymphs and adults, fell to the 
ground, and very few of them revived. 
YOTHERS, T7. U„ , and MCBRIDE, 0. C. (2334) 
1926. FACTORS AFFECTING THE CONTROL OF THE. GREEN CITRUS APHID TTITH 
NICOTINE LUST. Fla. Hort. Soc. Proc. 1926, 39: 169-171. [Abstract 
in Rev. Appl. Ent. (A) 16: 197-198. 1928.] 
